In:
Journal of Applied Polymer Science, Wiley, Vol. 41, No. 3-4 ( 1990-01), p. 775-782
Abstract:
The triblock copolymer styrene‐ b ‐tetrahydrofuran‐ b ‐styrene was prepared from commercially available hydroxyl‐terminated poly(tetrahydrofuran), M n = 1,650 and mono‐hydroxyl‐terminated polystyrene, M n = 7,600. Poly(tetrahydrofuran) blocks were first chain extended by reaction by with 1.1 equivalents 4,4′‐diphenylmethane diisocyanate (MDI) and subsequently end capped with 20% excess of hydroxyl‐terminated polystyrene. Gel permeation chromatography revealed clearly the success of the end capping step to give triblock copolymer mixed with a small amount of excess polystyrene. 1 H NMR revealed a gross composition by weight of 50% styrene, 41% tetrahydrofuran, and 9% MDI. DSC revealed a 5°C elevation of the PTHF glass transition and a 15°C lowering of PS glass transition temperature as compared with those of the individual component blocks. These values along with behavior of films as a tough elastomer are consistent with triblock structure and microphase separated morphology. The polymer does not flow readily below 125°C which is well above T g of the polystyrene domains.
Type of Medium:
Online Resource
ISSN:
0021-8995
,
1097-4628
DOI:
10.1002/app.07.v41:3/4
DOI:
10.1002/app.1990.070410324
Language:
English
Publisher:
Wiley
Publication Date:
1990
detail.hit.zdb_id:
1491105-X
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